text: The spin state of the complex affects an atom's ionic radius. For a given d-electron count, high-spin complexes are larger.
  ;d
  :Octahedral high spin: Cr, 64.5 pm.
  :Octahedral low spin: Mn, 58 pm.
  ;d:
  :Octahedral high spin: Fe, the ionic radius is 64.5 pm.
  :Octahedral low spin: Fe, the ionic radius is 55 pm.
  ;d
  :Octahedral high spin:  Fe, the ionic radius is 78 pm, Co ionic radius 61 pm.
  :Octahedral low spin: Includes Fe ionic radius 62 pm, Co ionic radius 54.5 pm, Ni ionic radius 48 pm.
  ;d
  :Octahedral high spin: Co ionic radius 74.5 pm, Ni ionic radius 60 pm.
  :Octahedral low spin: Co ionic radius 65 pm, Niionic radius 56 pm.
  ;d
  :Octahedral high spin: Ni ionic radius 69 pm.
  :Square planar low-spin: Ni ionic radius 49 pm.